While that's generally true, in some cases, the flavor difference is more noticeable than it is in others.
Today was a perfect example. I have a stovetop popcorn popper, and I used it today for the first time.
Holy cow, what a difference over the microwave stuff.
The flavor is much richer -- you need less salt, less butter (Actually, I really could have eaten it without either. Seriously.). I felt satiated far sooner, so I ate less.
I think I'd forgotten what real popcorn tasted like.
Another product where real tastes way better than the packaged stuff? Cocoa. Stovetop Ghirardelli cocoa beats the tar out of the powdered stuff. And that's even with skim milk.
I don't want to sound like a Whole Foods disciple, and I'm not going to get on a tear about how we Americans are lazy and take shortcuts at the cost of satisfaction and food quality -- it's too cozy and awesome a day for that -- but for some things, it really is worth it to take a little more time. The results can be dramatically superior. The increase in pleasure matters.